Biosorption performance of thiosalicylic acid modified isatis tinctoria for Pb(II) and Cd(II) ions: batch and column studies

ABSTRACT

The biosorption of Pb(II) and Cd(II) ions onto thiosalicylic acid modified Isatis tinctoria (TS-I) was investigated. The characterization of I. tinctoria and TS-I were determined by SEM, FT-IR and TGA. The biosorption equilibrium and kinetic data well matched with the Langmuir isotherm and pseudo-second-order kinetic models, respectively. The biosorption of metal ions from the synthetic wastewaters was also investigated in the systems. TS-I has a very high biosorption capacity for metal ions due to the chelating effects of thiosalicylic acid in metal complexes and, it is an effective and eco-friendly biosorbent for the biosorption of metal ions from aqueous solutions.

KEYWORDS:

• Isatis tinctoria
• thiosalicylic acid
• biosorption
• heavy metals
• modification
• kinetics

Acknowledgements

The authors would like to acknowledge to Anadolu and Eskişehir Technical Universities Scientific Research Projects (1409F388) for financial support.

Disclosure statement

The authors declare that they have no conflict of interest.

Statement of novelty

Although many of the published papers about the removal of pollutants (such as heavy metals and textile dye effluents) are available in the literature, there are not any other studies that are processed on the heavy metal removal by using a novel biosorbent, which is thiosalicylic acid modified Isatis tinctoria. Therefore this research diverges from the other researches in this point of view. The characterization of I. tinctoria and thiosalicylic acid modified Isatic tinctoria (TS-I) were determined by SEM, FT-IR and TGA. The main goal of this study was to investigate the possible use of the novel modified biosorbent as an alternative material for the removal of the heavy metal pollutants such as Pb(II) and Cd(II) ions from aqueous solutions. The biosorption of metal ions from the synthetic wastewaters was also investigated in single and binary systems. According to the literature, TS-I has a very high biosorption capacity for metal ions due to the chelating effects of thiosalicylic acid in metal complexes and, TS-I is an effective and eco-friendly biosorbent for the biosorption of metal ions from aqueous solutions.

Additional information

Funding

This work was supported by the Anadolu University [1409F388].